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Consider the titration of 50.0 mL of 0.0500 M H2NNH2 (a weak base; Kb = 1.30e-06) with 0.100 M HClO4. Calculate the pH after the following volumes of titrant have been added: (a) 0.0 mL pH = (b) 6.3 mL pH = (c) 12.5 mL pH = (d) 18.8 mL pH = (e) 25.0 mL pH = (f) 37.5 mL pH =
Since phosphate ionization of 2.14, 6.86 and 12.4. you make stock buffer 500mM in 1L. You decide to make one stock pH 6.5 and the other ph 7.2 How many mmols of what type of phosphate componet do you add to each of these buffers?
What is the product in a base catalyzed aldol condensation reaction between: 2 mmols acetone and 8 mmols benzaldehyde? 2 mmols acetone and 8 mmols 4-methylbenzaldehyde
spontaneous at high temperature or spontaneous at low temperature. (a) The temperature of a sample of Co(s) is lowered from 60°C to 25°C. (b) Ethyl alcohol evaporates from a beaker.
Typically, gasohol is a mixture of 90% octane H8C18 and 10% ethanol C2H4OH. Determine the energy output of 1 gram of gasohol using the following two pieces of information
when 50.0 gram of metal at 75.0 C is added to 100 grams of water at 15.0 C the temperature of the water rises to 18.3 C. Assume that no heat is lost to the surroundings. What is the specific heat of this metal
Celsius is allowed to expand into an evacuated vessel of 2.50 L volume. Does the gas do work? Explain
The temperature of the calorimeter and its contents increases from 20.00 C to 23.69 C. What is the heat capacity of the calorimeter (J/C)
The value of K_c or K_p for a stated chemical equation is equal to a constant at a given temperature. Also, and most importantly, if you want to make $25, add me on skype (kasparov586)
The cloth shroud from around a mummy is found to have a 14C activity of 8.8 disintegrations per minute per gram of carbon as compared with living organisms that undergo 15.2 disintegrations per minute per gram of carbon.
Neon crystalizes in a face-centered cubic lattice. It's density is 1.45 g/cm3. What is the edge length of the unit cell? Note: The atomic weight of Ne is 20.2 g/mol, and Na is 6.02 x 10^23/mol
Using the formula W = mg, how many milliliters of water with a density of 1g/mL are required to weigh 0.75 newtons and g = 9.81 m/s2?
The acid dissociaton constant Ka, for nitrous acd is 4.4x10^-4, what is the basicity constant Kb for the conjugaed base, nitrite, NO2-? HNO2+H20 H3O+ +NO2-
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